package tech.yozo.bamboo.ui.reading;

import android.annotation.SuppressLint;
import android.graphics.Bitmap;
import android.graphics.Matrix;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.ViewModelProvider;

import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import tech.yozo.bamboo.R;
import tech.yozo.bamboo.databinding.FragmentReadImageBinding;

/**
 * A simple {@link Fragment} subclass.
 * Use the {@link ReadImageFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class ReadImageFragment extends Fragment {
    private ReadingViewModel model;
    private FragmentReadImageBinding binding;

    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    public ReadImageFragment() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment ReadImageFragment.
     */
    // TODO: Rename and change types and number of parameters
    public static ReadImageFragment newInstance(String param1, String param2) {
        ReadImageFragment fragment = new ReadImageFragment();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @SuppressLint("ClickableViewAccessibility")
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        model =  new ViewModelProvider(requireActivity()).get(ReadingViewModel.class);

        binding = FragmentReadImageBinding.inflate(inflater, container, false);

        ImageView imageView = binding.imageView;
        imageView.setOnTouchListener(this::onTouchImage);

        LiveData<Bitmap> liveImage = model.getImage();
        liveImage.observe(getViewLifecycleOwner(), binding.imageView::setImageBitmap);

        return binding.getRoot();
    }


    private boolean onTouchImage(View v, MotionEvent e) {
        // 获取ImageView当前的变换矩阵
        Matrix imageMatrix = binding.imageView.getImageMatrix();

        if (e.getAction() == MotionEvent.ACTION_UP) {
            // 创建一个逆矩阵
            Matrix inverseMatrix = new Matrix();
            // 求逆，逆矩阵被赋值
            imageMatrix.invert(inverseMatrix);
            // 通过逆矩阵映射得到目标点 dst 的值
            float[] dst = new float[2];
            inverseMatrix.mapPoints(dst, new float[]{e.getX(), e.getY()});

            // 选中文本
            model.doSelectText(dst, imageMatrix);
        }
        return true;
    }
}